docs: def attach_zone(geoid, organization_id_or_slug):
      '''Attach a zone <geoid> restricted to level for a given <organization>.'''
      organization = Organization.objects.get_by_id_or_slug(
          organization_id_or_slug)
      if not organization:
          log.error('No organization found for %s', organization_id_or_slug)
      geozone = GeoZone.objects.get(id=geoid)
      if not geozone:
          log.error('No geozone found for %s', geoid)
      log.info('Attaching {organization} with {geozone.name}'.format(
               organization=organization, geozone=geozone))
      organization.zone = geozone.id
      organization.save()
      log.info('Done')